Electrically operated hot air furnace



Dec. 26, 1933.

A. G. WATSON ET AL ELECTRICALLY OPERATED HOT AIR FURNACE Filed May 17, 19:52,

J? I\\\\\\ \\T Patented Dec. 26, 1933s UNITED STATES ArENr OFFICE,

ELECTRICALLY OPERATED no'r AIR FURNACE Agnes Gertrude Watson and Albert Edward Robingson, London, Ontario, Canada Application May 17, 1932. s rial No. 611,886

1 claim. (01. 219-38) Our invention relates to improvements in electrically operated hot air furnaces and the object of the invention is to provide an improved means for operating a hot air furnace through the me- 5 dium of electrical heating elements.

A further object is to provide means to cause the 'air to .be heated to pass up between and through the heating elements which are of perforated construction, the faces of said elementsv being positioned in inclined diverging planes.

A still further object is to provide means for supporting the elements in the above. position in the furnace casing.

With the above and other objects which will hereinafter appear our invention consists in its preferred embodiment of a construction all as hereinafter described and illustrated in the accompanying drawing in which,

Fig. 1 represents a vertical section through a hot air furnace casing of our particular construction showing the heating elements positioned therein.

Fig. 2 is a horizontal section through the line 2-2 Figure 1.

Fig. 3 is a perspective detail of the tripod stand for supporting each element and,

Fig. 4 is a cross sectional view through one of the elements. I

Like characters of reference indicate corre-' sponding parts in the different views.

A hot air furnace control constructed to adapt itselffor use with our heating elements may well comprise a cylindrical casing 1 provided with a suitable heatinsulating lining 2 and the usual truncated, conical top portion 3. A cold air inlet 4 is provided in the lower portion of the casing 1 for the admission of the cold air to the furnace and such inlet of cold air'may be produced by means of a forced draft such as by employing a circulating fan. This circulating system however forms no part of our invention and is therefore not described.

In the upper part 3 of the furnace casing we provide the hot air outlet 5 whichis adapted to be connectedwiththe usual hot'air pipes to the house registers. be duplicated around the upper portion 3 of the casing 1 as described, depending upon the number ofpipes to be connected to this upper portion which constitutes a header therefor.

Our heating elements 6 are preferably of the disk type having perforations ltherethrough the heating element resistance wires 8 being wound therein and enclosed. I

Any suitable form of heating elements canbe used and such elements are adapted to be 'supported with their faces in planes diverging outwardly away from the vertical from bottom to top.

The disk elements 6 preferably consist of a composition which is an admixture of high tainthe back ofthe heating element.

Obviously the outlet 5 may spi ally a The cold air as above described is admitted through the inlet 4 and when the heating elements are functioning such air passes upwardly in thefurnace casing 1 between the elements 6 as well as through the perforations therein being heated in the process and the hot air being I discharged through the outlet 5 into the circulating pipe or pipes (not shown). The'insulation 2 prevents the heated air in the casing from warming the surrounding air ensuring that it be passed in a heated condition to the outlet 5.

The control of the functioning of the electric heating elements can be achieved by a thermostat if so desired but as this forms no part of the present invention it is not described.

From the above description it will be seen that we havedevised a simple and effective means of heating the. air in hot air furnaces through the medium of electric heating elements wherein the consumption of the current will not be excessive due to the particular position of the heating elements. It is to be understood that suchheating elements are preferably of the:heat absorbing type, the disks being composed of heat absorbing cementitious material or the like.

Whatweclaim as our inventionis:

In an electrically heated hot air. furnace, the

combination with a furnace casing havinga cold air inlet and a hot air outlet in the vicinity of the bottom and top thereof respectively, of a plurality of spaced apart electrical heating'elements,

arranged in the casing'between the cold air inlet and the hot air outlet, each element being inclined outwardly away from the vertical frombottom to top and a tripod stand for supporting each element'in the inclined position in the casing between the cold air inlet and the hot air outlet, said stand comprising aninner leg for supporting the lower edge of an element and a plurality of legs for supporting the upper part of an element. I

AGNES GERTRUDE ,WATSON. ALBERT EDWARD ROBINGSON. 

